CoStar Group Inc (CSGP)

Rating: HOLD

Methodology: Valuation triangulated across five independent anchors — Monte Carlo (Student-t + regime switching), an independent DCF, peer re-rating, a sum-of-parts, and a scenario-weighted PWEV. Figures reconciled to Alpha Vantage 2026-06-27. Each chart below sits with the part of the thesis it evidences.

Investment Thesis

The bull case — 'Bull — Re-Rate' (8% weight) — targets $54, +89% vs spot. It needs the multiple to hold or expand.

The dashboard below is the whole argument on one page: spot ($28) against each valuation anchor, the scenario tree, technicals and the options-implied move.

Anti-Thesis (The Real Bear Case)

The structural case — 'Structural — Brokerage / Data Disruption' (20%) — targets $13, -53% vs spot. This sits below the 52-week low — a genuine structural impairment, not a mild pullback.

Key Debate

P/E Multiple explains 66% of Monte Carlo outcome variance — i.e. value is set by the multiple the market will pay, a rate/sentiment regime bet as much as an earnings bet.

Earnings-Call Disconfirmation & Sentiment

Derived signals from the MCH market-data store (Alpha Vantage transcripts + news). Quantitative tone only — a disconfirmation flag, not a substitute for reading the call.

Management vs analyst tone (2026Q1): management +0.37 vs analyst floor +0.01 → delta +0.36 (n=19 mgmt / 10 Q&A; 44th pctile across the S&P book, z -0.2).

Flag: TYPICAL — management-vs-analyst tone within the normal cross-sectional range.

News (last 365d, 1000 articles): avg ticker sentiment +0.10 (bullish 22% / bearish 9%)

Scenario Analysis

The tree runs from a structural 'Structural — Brokerage / Data Disruption' downside ($13) to a 'Bull — Re-Rate' bull case ($54); the probability-weighted blend (PWEV $30) is +7% versus spot.

Scenario rationale — what each probability buys (the driver path behind every target):

• Structural — Brokerage / Data Disruption (20%, $13). Structural impairment — transaction-volume recession / disruption: earnings AND the multiple compress together. Target sits below the 52-week low by construction. Drivers — implied_target: 13.31; probability: 0.2.
• Transaction-Volume Recession (17%, $23). Cyclical downturn — transaction volumes + leasing / capital-markets activity + data/SaaS subscriptions weakens for 1–2 years before normalising. Drivers — implied_target: 22.6; probability: 0.17.
• Base — Resilient Recurring + Transactional (35%, $31). Mid-cycle — normalised transaction volumes + leasing / capital-markets activity + data/SaaS subscriptions; disciplined capital allocation; steady returns. Drivers — implied_target: 31.38; probability: 0.35.
• Growth — Capital-Markets Recovery / Data (20%, $42). Upside — capital-markets recovery + data growth lifts earnings above mid-cycle; the multiple expands modestly. Drivers — implied_target: 42.37; probability: 0.2.
• Bull — Re-Rate (8%, $54). Upside tail — sustained tight conditions or a structural re-rate on capital-markets recovery + data growth. Drivers — implied_target: 53.51; probability: 0.08.

Valuation Triangulation

Five anchors — but read them with their basis in mind. The Monte Carlo, the DCF terminal, and the peer re-rate all key off a market multiple, so they are not fully independent; only the discounted cash flows themselves are genuinely multiple-free. The discipline is to read the spread and weight the cash-based view, not to treat five numbers as five independent votes.

peer P/E re-rate excluded from the weighted blend — diverges >55% from the Monte-Carlo / scenario core. For a high-leverage equity the per-share DCF (enterprise value less large net debt) is hypersensitive to the terminal multiple; a peer re-rate across heterogeneous margins is apples-to-oranges. Shown above for reference; the blend leans on the multiple-discipline and scenario anchors.

Monte Carlo — the distribution, not a point

10,000 paths, Student-t shocks (fat tails) with a regime-switching overlay. The median lands at $27 and 46% of paths finish above spot. The variance decomposition shows the p/e multiple is the dominant swing factor (66% of variance). Value is a multiple bet: fundamentals move the answer far less than the rating does.

DCF — the cash-flow anchor

Independent of the market multiple: a 5-year path, WACC 9.0%, 15x terminal FCF multiple → $30. This anchor is deliberately the heaviest (41%): it is the valuation least hostage to the current multiple regime.

Peer benchmarking — relative value

Against the peer cohort, re-rating to the peer-median forward multiple (P/E 37.239999999999995x) implies $63. A premium is only justified by superior growth/margins; otherwise it is multiple risk. Weighted just 12% so the market's mood does not drive the fair value.

Across all anchors the spread is wide (genuine disagreement — low valuation confidence).

Revenue-Segment Breakdown

The company-specific drivers behind the valuation — each segment carries its own growth, margin, multiple and capex intensity. (Tags: FACT reported · ESTIMATE from disclosures · INFERENCE judgment.)

Named Exposures

Demand & pricing cycle (FACT/ESTIMATE)

Capital intensity & shareholder returns (ESTIMATE)

Structural risk vs optionality (INFERENCE)

Industry Context — Real Estate

This name sits in the Real Estate as a real_estate_services. transaction volumes + leasing / capital-markets activity + data/SaaS subscriptions Its scenarios are not guessed in isolation — they inherit a single, shared view of the cluster's driver cycle, so the names that depend on the same event are mutually consistent.

Value chain: WELL (reit_core) · PLD (reit_growth) · EQIX (reit_growth) · SPG (reit_core) · AMT (reit_growth) · DLR (reit_growth) · O (reit_core) · PSA (reit_core) · VTR (reit_core) · CBRE (real_estate_services) · IRM (reit_cyclical) · CCI (reit_growth) · EXR (reit_core) · VICI (reit_core) · AVB (reit_core) · EQR (reit_core) · SBAC (reit_growth) · ESS (reit_core) · WY (reit_cyclical) · INVH (reit_core) · HST (reit_cyclical) · MAA (reit_core) · REG (reit_core) · DOC (reit_core) · UDR (reit_core) · CSGP (real_estate_services) · BXP (reit_cyclical) · CPT (reit_core) · FRT (reit_core) · ARE (reit_cyclical)

On the cluster's key downside — Rate Shock / Oversupply / Demand Loss () — this name implies 37% vs the cluster house view of 37% (in line with the house). The cluster's full cross-stock reconciliation governs that the names which ride the same capex cycle assign it comparable odds.

Structure: Shared State — The real_estate cycle is the shared macro driver. Driver — same-store NOI + occupancy + FFO growth + cap rates / interest rates + property demand Dispersion — Members differ by cyclicality (quality compounders vs deep cyclicals).

Model Appendix

DCF — line items

FCF is bridged: NOPAT + D&A − Capex − ΔNWC (capex intensity 3% of revenue, weighted from the segments) — not a single conversion fudge.

WACC 9.0% · Σ PV(FCF) $3B + PV(terminal) $9B = EV $12B; + net cash → equity $12B ÷ diluted shares 0.41B = $30/share (exit-multiple terminal).

• Gordon (perpetuity-growth) terminal at 2.5% → $31/share — a genuinely non-multiple, cash-based cross-check; the exit-multiple and Gordon values bracket the terminal-value risk.
• Incremental ROIC on the forecast capex ≈ 33% vs WACC 9% → above WACC — the build is value-creative.

Peer set

Peer-median fwd P/E → $63; EV/Rev → $77.

Weighted fair-value math

Sensitivity

DCF/share — WACC × terminal multiple

DCF/share — revenue CAGR Δ × op-margin Δ

Tornado — DCF/share swing by driver (widest first)

Company lever — SoP/share vs Real Estate Services multiple (AI re-rating) (base 18x)

Load-Bearing Assumptions

DCF: WACC 9%, terminal multiple 15×, FY+5 revenue $4B. Triangulation leans 41% on DCF, 29% on PWEV.

Reasons the Thesis Could Fail (Falsifiable)

The valuation is multiple-dependent (66% of variance); a de-rating toward the DCF anchor ($30) implies +5%.

Fact / Inference / Speculation

• FACT: Spot $28; 52-week range $29–$97; engine rating HOLD; base-case target $30 (+7%).
• INFERENCE: Triangulated FV $29 (+4%). P/E Multiple explains 66% of Monte Carlo outcome variance — i.e. value is set by the multiple the market will pay, a rate/sentiment regime bet as much as an earnings bet.
• SPECULATION: At current prices the embedded bet is that the multiple holds or expands — P/E Multiple carries 66% of outcome variance.

Recommendation: HOLD

Balanced: triangulated fair value $33 (+18% vs spot); the outcome hinges on P/E Multiple. The debate is P/E Multiple (66% of variance) — fundamentally a multiple/regime call. SBC runs —M TTM (disclosed in the appendix).